The markers that show where new posts begin since your last visit has quit working in our forum. Can someone offer assistance to repair this feature?
Hi :D I suggest you first to update your installation to Vanilla 3.3. 2.2 is an old and outdated build that may miss some features and security updates.
And if you talk about this feature (screen is in french but you may recognize it):
It is (as I know) only availabled using "Modern Layout" for discussions lists and show only if you bookmarked the discussion (or participated to the discussion). Screen taken on 3.3